BUG: unable to handle kernel NULL pointer dereference at           (null)
IP:           (null)
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
PGD 5986a067 P4D 5986a067 PUD a408e067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 8440 Comm: kworker/1:3 Not tainted 4.14.204-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: pencrypt padata_serial_worker
task: ffff88805d4aa200 task.stack: ffff88805d4b0000
RIP: 0010:          (null)
RSP: 0018:ffff88805d4b7cd0 EFLAGS: 00010296
RAX: 0000000000000000 RBX: ffff8880aebbac50 RCX: 1ffff1100ba96fa2
RDX: 1ffff11015d77582 RSI: 0000000000000000 RDI: ffff8880aebbac00
RBP: dffffc0000000000 R08: ffffe8ffffd27170 R09: 0000000000000002
R10: 0000000000000000 R11: ffff88805d4aa200 R12: 0000000000000001
R13: ffff88805d4b7d10 R14: ffff8880b1303e00 R15: ffff8880aebbac58
FS:  0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000097970000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 padata_serial_worker+0x232/0x3e0 kernel/padata.c:307
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code:  Bad RIP value.
RIP:           (null) RSP: ffff88805d4b7cd0
CR2: 0000000000000000
---[ end trace ffc31f0d4134bf5c ]---